Alumina composition, alumina molded article, alumina ceramics, a

Details Alumina composition, alumina molded article, alumina ceramics, a Alumina composition, alumina molded article, alumina ceramics, a

1996-05-28

1997-09-30

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Refractory

501153, C04B 3510

Patent

active

056725540

ABSTRACT:
An alumina composition, an alumina molded article, prepared from the alumina composition, an alumina ceramic prepared by sintering the alumina molded article, and a process for producing the ceramic; the alumina composition comprising .alpha.-alumina particles having a ratio of the shortest diameter to the longest diameter of from 0.3 to 1; and a size distribution of not more than 5, as expressed in terms of a D.sub.90 /D.sub.10 ratio, wherein D.sub.10 and D.sub.90 represent a cumulative 10% diameter and a cumulative 90% diameter, respectively, of a cumulative distribution depicted from the small diameter side, or comprising .alpha.-alumina particles having a polyhedral shape; a D/H ratio of from 0.5 to 3.0, wherein D represents a maximum particle diameter parallel to a hexagonal lattice plane of a hexagonal close-packed lattice of .alpha.-alumina, and H represents a particle diameter perpendicular to the lattice plane; and a size distribution of not more than 5, as expressed in terms of a D.sub.90 /D.sub.10 ratio, wherein D.sub.10 and D.sub.90 are as defined above.

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"Alumina as a Ceramic Material", Gitzen, American Ceramic Society Technical Literature (1970) pp. 7-28.
T. Ohigara, et al., "Preparation of Monodisperse, Spherical Alumina Powders from Alkoxides," Journal of the American Ceramic Society, vol. 74, No. 9, pp. 2263-2269 (1991).

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